Ram upgrade

I guess it will be DDR3 memory. You can go to crucial or kingston and buy ram directly from them. Alternativly go to your local PC components store and purchase some ram. I bought offical macbook ram for my 2008 macbook and when it came it was the same as the memory in my dell notebook except it had an apple stick on it. Same speed, manufacture and size.

Will save you a few pounds.

If you want a guide go here

http://www.ifixit.com/Guide/Installing-MacBook-Unibody-Model-A1342-RAM/1666/1

mike

 

204-pin DDR3 SO-DIMM RAM modules is what you need.
Depending on the model, you can have up to 8 GB RAM.

To make sure:

Upgrading RAM in MacBooks and MacBook Pros​